Give back to the local rural community in Singburi in Thailand and teach the local children in one of the many rural schools. You can also try school construction/maintenance and learn the art of Thai boxing!
Learn more: Volunteering in Singburi, Thailand

The Greenway School in the Pul village of Samraong in Cambodia, teaches various subjects to children from poorer backgrounds, who otherwise could not afford education. Here you will have the opportunity to teach English to the local children.
Learn more: Volunteering in Cambodia